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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79e2aa96c231d047c192d5eb206bfa27aa52c4f594f8c9c42149342d8aca33c' 
  AND token = 'hL9wuFyrfNW/iF8k+4vF3iA0BZbiIQn9NfZ53IWjb/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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