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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fd47b7495a57a29ce76d091b300033444b30ea1d01ca55cbd83827f7cd82b7' 
  AND token = 'aeyC+ua3w+iVLir2execsRUDzQp5qaZrvBbalq+qFZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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