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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e875b60758f27283e589e73a20940e01fe0a7e049f58d5e181f3b5aae2d0986b' 
  AND token = 'vJwIMkPfcLgidgf+SrD/lOZY9JAInGlZP6TLwd0BwTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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