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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174f1448ed45590ca75d741624244f5ddeda1295c8a1aed8fa246633b38ad1be' 
  AND token = 'JKxA9jCCqnzuamrNSsk5UQTZSWwqa1G24iQIruIUu3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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