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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a607b776bc4c61a4901371e10ec9730a09271489be67177eef754766db6a839' 
  AND token = 'RaG3SC/9Xu/GWFr9Z49wVcMn8wYAf28oQVYG31ImzjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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