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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3029f45a02554a2b3489017f14dea172bbee733a071bc90f95f3fff8a734f4' 
  AND token = 'XYxBqVz2eg16LD5fmPeeUzEfPnFflIUBgUSHen17xK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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