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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bb9546b6cb3bdb72f16ef0463d7014c4972d681a2307d639d6194c32ebbe92' 
  AND token = 'wLnU+QJW+tlEAxalz4rcgWOMOk7EicGZaTvPf6Adh4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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