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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5edbf6b9e0aef1223abdd5205f99244daec54e2efb5723997e0d789dffceccc' 
  AND token = 'i0rwjlI0By7i41VNgQiqqjTnDal31/5Sq9oryWGvRNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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