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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e23a01648e18f60fb370c06f1ef6cd33f54fd32e76ccc9bd10ad314eaf5f86' 
  AND token = 'arNk9JCpejWpVPG2OBW7ItVaVTEtkTTKmoybqQATOIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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