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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e68246b22847ecdd9d61cc5faa7d594b3bae856c256921241ac8f9684f93e1' 
  AND token = '8grNE5IuIPZitZZ/2l+Rcg561pz84dX9uCtKTQiqxBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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