SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc3aecf4bb08720293bb4550318f3ff3309ed41a39ec4dcc798803ca2632f55' 
  AND token = 'JZh6X9HupkZb5U+j6WpYKEpw1GzJqv2FgmDJuWJVHpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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