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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51aea38a102131f23b7d6606b13e08feda52ab24cdd29278c5c3eba375407567' 
  AND token = 'TFW4C6IMBHTKmLvFWQIK15yNmrDfhPzrvHujS49piJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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