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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f889f4711eb9917bf08b653f6eea881b259852d2728aa88d7926eeb61fa0df0' 
  AND token = 'VNUNuHPIxhJTGwWZ1Yj9Y8ZWlf0OqwJkIXdcRX+bx1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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