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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a2df5b02965760fc6d0a732f065d8da457ad6293c1b1e6d2dd5ac1b29f61e5' 
  AND token = 'fju404g+i8Zhx4m3e3Yz2vHpmtukaQcmDwv2wPi7iRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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