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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6264a57ab47b0a7aea0e8608f5ebc57f9a9c7c7e8c637c6c77adcff103e0012' 
  AND token = 'Utb0XoKH8XMuZXgVRSCmnwNFPJ1nCvE2/pdX8IcEkMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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