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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df73f8237e053ebe02dd1040ce3a56cc70148e8712394d66b5311813c118fa1' 
  AND token = 'STxWI6hlTiUsDQoFaT89mNeojj+GYJgabn4Jtf4SDrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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