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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cd2c2b8d79bc5ccc160f16cde4a6c50f725849744e646de1b707f996a0d664' 
  AND token = 'w7IKg5QP9CZukQK+AB56IXeGeZNT2Gd6vjMmrPv8Lqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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