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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91151fc301bb0d74c45a9e2cdd8ac8d4368d78014b4812e49a7fe4258579bcd4' 
  AND token = 'fF1LIwrKxKVuX8lKFHAuMuMw5cZ6JlqUcpit8FHz76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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