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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f739612c3daab9fac1529f07826d76662470afab079681e362270632a41e70' 
  AND token = 'kA9yn8BVaeiB9/MrUR/vNlOp7uKj0zEymVpo+4N3Y2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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