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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9774704394b4a7318bd33c40db783bac8c99eb098f7903533e028bdc6e90a31' 
  AND token = 'bsBk/o3Lb5fcUsuXZQ7vSm8GkJO7tjH959Cw0iE1sRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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