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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd723985838bd28629ae74ba085f267517c5bac3769b1ee8b8363ea61adeeb0d6' 
  AND token = 'YnxhWgi6d/csvHz82R4Git5CoH7R2MIVmpPdIcnyORo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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