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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b283e1aa1c45ad5d0e015ebb7f7c03061b779bf6f7425bf4996fc253504dc24d' 
  AND token = '4Pfovr9oD9oYxcG6c3IwIEr4EEph0HtufZ65gfMw+7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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