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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c6db29799f5d3b7df5174372ca76c310bf6f5a736b81eacefd1208be65cab7' 
  AND token = '+dGfqeygJ+15sGc84gc9zP8BHUSwxuhNUsg/dIB6OE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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