SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64358c3e6a572ce731f59d3b2cc79c82142d7109df1df0185c71b81ff41e2f8f' 
  AND token = 'xW/ZIBsyWJrihQ2PL6HTPvRTJVpgAOcfndlnBWHWghI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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