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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e2dd663b5e81a43f5e959ccef6e3138932d1918d90de54101847f33b23d918' 
  AND token = 'EP3XdENN5Z6dEhUU3wJ7FcZSD8gpIgK2bUUZYEfRb8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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