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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792ff9c3ca8843a9f2ba92802af33925fb2541195d831900f80de65a39c1dfb5' 
  AND token = 'b2RK4hRp1aOq8dTP5E7q3HwYe9H+tVu68sDtIRgE1Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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