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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5201c3fb660874c4f6b5b742b7935a4b107e6492654596abfab9b451f03e1234' 
  AND token = 'bq8z9UdQzPperaTqUYrMJuIWibIKEQheg5koqY1xoBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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