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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a7164fd25f6466e88c4101ed4ed2deda5582118b7ca41c7d6dc0e6d62060a8' 
  AND token = 'cogG7JZJPF2PMusdctqm26jq7CSV4lM6iB3GVhgottY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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