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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9deda475ae6d501f94cfb50f58a53a369515103bb51165a5bcb577f6576369' 
  AND token = 'FnJLf0/bYDxlFNgqcm3rfFiS42pU6tsn0Ujuvx3OfkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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