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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce6ee79391c03939abb208f2538941870090db4ed6ed4bec530f9981c7f4bd4' 
  AND token = 'xBGym39HXr50RiduDZ09Dnj/W6QPtlaieamcts0D6sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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