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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657e5092853c54db6f0c92b8ff573e20473dc11d7538f19f05d59ee621efedaa' 
  AND token = 'eVvDS1TQe8ngPwO0mZx9IoMFIinimEOn/figF6f0ld4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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