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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd42a1dc1d760a2ca91ca109552f000c19f439e12a34419e830b86ef068a058' 
  AND token = 'P7i5ICT5w77ZJEvYqWrOWPzDoyln485siIfc5nYsN6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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