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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b615b7467116141519ad11c17079b0788e14c3736ed961e137a1880d61b25b' 
  AND token = 'xHr8ItWGob7hJpF2nz0IGVKGTAD0J8D2aryl43+zmQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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