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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fa386427fa33ff2f9d8da199d1f0c208201af31c7988e86e11d91a60a0683d' 
  AND token = '2mz5hJKTIwtgG1+j8W0nVTlaErLasPYjGvkRt3H8OVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00294

JSON explain

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