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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93d1a2ba37ac526d6e8a806a945636249203a5b65b2e2b185c96f59674ef0e3' 
  AND token = 'ez95UHa1RTA6SFZjvTC0cGoX5xns3HbBbtieH5nmti8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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