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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb99dff0bc245334ab3045c5b77b35976c4a156a162a6aa9b5097d0155d8c93a' 
  AND token = 'zhk2Y64ivg+mrxyiHwNQ72rzQOAjun3KR9hbEZkJnAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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