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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c74ba4d47e7e1178eba4acdae085619bd38c6128c6154ca9d1c748a4f7a1b6' 
  AND token = '3Au/9t+fbyKq8zNH1GAGKAnV9TdyvxSHBcwYqITViOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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