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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c413e9ac3e24d9a223688ebe57dbc289c3e15fdba00b7dee577b4b2f3b7dd1' 
  AND token = 'Gen/L2/ImliyQpJNUWNL5vUKI8woa4Tz4Woi6WIf3GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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