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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a8980fda40033c256dd4e46bb7de98e10a7eaede9be4d3b1d9e7473c7896f7' 
  AND token = 'Pl1HJdxVkj8YG3H5sl9xaEGmw/XwIjaVB/cSrsX7qzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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