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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a6f153be70b75dba87134e4744b11974598b6a9deb13e69760134487ad8c3a' 
  AND token = '561feNHC5szM3+Ag469D5cxu4vYzBY0ax2K5TdVDUbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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