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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b502e62802c2afd0f50d6aa5cc5a7f85ff7095783c7874468615606096f7445' 
  AND token = 'Ccn4d4Qpu8RzKZIQ+3ay+pItQYZbHpnPpESATgwuoYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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