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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36de7d5f325189622c2f968ef1d3353b466cc8e09aa14393af212bd383e6a10a' 
  AND token = '7gWT39sHrDGLqvi6L9ypSGz8f9KMNBz3zRv02rg6VvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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