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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e0bc86966ac1981ef0d1a0c5db25ee6cc0512edd8c40c53c8e377ce4cb98b6' 
  AND token = 'KG99a01sajDPYp5xBOA6xYIh7SdMjmbsFcTTm8qjToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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