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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d1b1adae21dcb7b9bb12c3c6c054b349670895269705b3673371e8d84e9834' 
  AND token = 'U7PiQdAA1LuRyR1ZjVsxv0T33l1L4URXPHahgdB6E44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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