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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e263971cb3c59b7ab342bcd8f9bb11487233e418ec45dd5690035c27a64554e5' 
  AND token = 'WXI4PDSujM0vkujJ5acDJmbHJh/DcXOwM6845Y61uMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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