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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e7e7d0d8bf09ae954cd896eee78a37422e71528fdabec74987e924ad36dc66' 
  AND token = '352oFxoKI5b2Zkq4/S0k8BEC9QDbCUC1aEGvJTwG708=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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