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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aba58ce2dd92c14c3ffdb5e820a5292f7e97e44fb60feb5b47316142e851a90' 
  AND token = 'AFJykWgDlwruy3IY5/nQaJ9p1SMKPlPL5LQaVCVlXeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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