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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63488311ad1320529ed8f9a0d33ab5f3111f75b16afa97a6fa7ca74c62592b0d' 
  AND token = 'guOcEMtBeH8jIwW59k02b6YH3TwE7CvPykyLj4GYGgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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