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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23ddf76a816d6e45982ac75c988fa7c1bd074e36e1b760dc0e5e923cb4deecb' 
  AND token = 'mLEo17s+9XNs4RLKaOcUkGO0MR86/TFFLHhgfPg6OAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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