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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba165a8e8d5a2f8bce5224828c40b9070d0c34df14abb9949e9eec4ac24495d3' 
  AND token = '/mNX1vx9+N9ENP0TOo+foZRTGa5rE8+qTLEFAvfSvcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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