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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa204ada915551e2fdacd2303dda1556e1402b9e5bbbe2f363d0c41b5bb6f011' 
  AND token = 'OzCnaYQQ3zBgqx3bo7wLKgq4bCo5rX62kRqmKatvLSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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