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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eeccbbcf3bac948fa138ba71fd923206a5d6c1ca45e09407b6692bac477028' 
  AND token = 'quaJG2FROhVHf6+bQAqMKLEMtDoNj3YsA86ep+OvpR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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