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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84ebe544c9c28fe9bcad8a7a866a4702d8f38cd43abe9cab6745847904d16ac' 
  AND token = '0Zo2QIk1tzqcyjslTgaTj+V6hwhj0YjUk0SO8rRdwSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}