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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36823baf91ad0d23fec6c4b0a3fa6b0018ec8c0c483f9f993b67294d1c256d24' 
  AND token = 'UDXeOqhLWaWLsgthQumPq7eNzRnHFCE7IdrA0rdsKYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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