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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deada4d866afd89691be5b0916246f1c45efaf4e117e1bbde4d89b829180bd3' 
  AND token = 'WMhuu9ctcV/vT1mPYWLXDERHSLbEL7eimddM54AIhqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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