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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ac4566c47db19a4b6fff32708f3ed2032640f7f4985aa6c5f184f0407bbcf9' 
  AND token = 'eXdKf4h1vtiXKQpL25pF89Rd//a0InJ9ZjrPx1CHp9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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