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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd825c68f532f8b9f81247f3c7eaec85bfe99dd2b85c84f5f9f2648a84f08a6b3' 
  AND token = 'qNofWMhZ0HS1ZxTg5/o/LrZqoSdtRvqldU0UKIax5wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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