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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547627b747da441d0227a5cac3c72204fb0ef42ef3eb66dd42d4af34b408465a' 
  AND token = 'NBZD1IG57NklSJ6U9dBWjtiCVo3JliYbBJ7QqFWODlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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