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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f843799ea131f44862452558415e958f123ce06a4527a784cf43099115a024' 
  AND token = '73CXrdAF6INNSnk3TcDziMobneTv1iXQfAWApzgvu4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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