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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bda88e41e2cfc4f61bfc8d08e20af35e9913789ff7209c4c3b723302f96476' 
  AND token = 'eP/zVbOTeYGow+8W+B/9oS34FH3C1hOJS99vIa66a9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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