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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5cea8a4e07784bbe4a7a8241188634e2d9a4ed11fd588a02127dfad6f173e6' 
  AND token = 'hHinVR7fLSrty524nig+Y+AAwvOpm/3AVgo/tB2E1zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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