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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae610297ca4a73fff6ae7eb1495a61e1ba4053996aa30a510ef037cf43426f40' 
  AND token = 'vbgHASbJcC0KraJO/TOayiCdzObW0iQeJAoZoslB6Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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