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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60620e7c1f1b0f32f10ea72470b3f52ad5f638338f429e18f7afbce2ad033b8' 
  AND token = 'PN3Z0eU6OadwEtIa8rXFwkUx4X+o64TqjnCLphuR07k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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