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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663a910e9490cfd7c15a1614d426664148c407af3ecaeea0f6f56f6fe7268427' 
  AND token = 'rscX6DfyfL6J8eaUuPBxafHUtiJm63dMSukBcb124/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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