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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3763af70b87a45d264ee81209a1a3a428ad398bad783edf77c419042c61f055e' 
  AND token = 'lfDESI2962CxXRk8PK012KbNr0jLIjDQ3+3JhLUXEAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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