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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d1278f1d6d8e4f6609ae51cdb6f578835b9cddff09155014440162ff9eb84d' 
  AND token = 'v9DmLU2ACZUdfv4+edkHLlBs/Z26SUKzFOGgVXkUXO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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