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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773f614001c6f1d2e9b2bf7c54d8e370c8f8de27da663781d9220dd3b43354dd' 
  AND token = '2GT5mSrhUqZVBErGT5FkR6JNT07PIswnql2hbtLzMuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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