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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e947feed12dc279c06af3be218aa3869a7c17296d7269b6920a14e085d1141b4' 
  AND token = 'J520IYdZh+SO0YGPSOa/emXAzOBZWtL2hNIAtUooiZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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