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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9768d12932cbbba12abcb743237b77b93997d0ca5dc87df3d62b3d2e873fbbfd' 
  AND token = 'S5Qs4iUACq0LT9F0FnBonusX3d4EP0h6TDMfINXxzwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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